What is the code P0174 on a Subaru Tribeca?

The code P0174 on a Subaru Tribeca indicates a lean condition in the fuel trim system on Bank 2 of the engine. When this code appears, it means that the engine is running lean, either due to too much air or not enough fuel .
A lean condition can be caused by various factors, including a vacuum leak, a clogged or damaged fuel injector, a dirty mass air flow (MAF) sensor, or a faulty oxygen (O2) sensor. It is important to note that the P0174 code is a generic code, so it has the same meaning for the Subaru Tribeca as it does for other vehicles.
To diagnose and fix the issue, it is recommended to check for any vacuum leaks, inspect the fuel injectors, clean the MAF sensor, and replace any faulty O2 sensors if necessary . It is also advisable to consult the vehicle service manual or seek assistance from a professional mechanic for a more accurate diagnosis and repair.
Please keep in mind that the information provided is based on the search results and may not cover all possible causes and solutions for the P0174 code on a Subaru Tribeca.

What are the symptoms of P0174?

P0171 and P0174 Symptoms
Surging or hesitating acceleration. Misfires (which will usually set a misfire code) Spark knock or detonation. Reduced power.

Which oxygen sensor is P0174?

P0171 is triggered by the engine bank 1 “upstream” oxygen sensor and P0174 is triggered by the engine bank 2 “upstream” oxygen sensor. The oxygen sensor alerts your system when the condition is too lean meaning there’s too much oxygen in the exhaust.

Can bad spark plugs cause P0174 code?

The p0174 is a lean code- there’s a chance that you have a small vacuum leak after the spark plug replacement from one of the pcv or intake hoses, or one of the throttle body bellows. The oil in the spark plug tube seals could also be your issue.

How do you fix Bank 1 too lean?

A common fix is replacing the air-fuel sensor or the O2 sensor. However, replacing these parts may not solve the issue’s root, since the code could be caused by a dirty or faulty mass airflow sensor or even vacuum leakage. The new O2 sensor may then be forced to read differently in an attempt to compensate for this.

Can a dirty air filter cause P0174?

Sometimes the Air Flow Sensor and the sensing wire get covered with dirt, dust, or oil residue, which can also set a P0174. Cleaning the sensor might hold off problems for a while, but eventually, the MAF sensor should be replaced. Always make sure the Air Filter and its enclosure are dirt-, dust-, and oil-free.

What is the most common cause of P0174?

Pro Tip: O2 sensors may “flatline” and then come back, which will usually set both rich and lean codes. A malfunctioning mass airflow (MAF) sensor is one of the most common causes of P0174 code.

Can you drive with a P0174 code?

Is it OK to drive with the P0174 code? Driving your car with the P0174 code doesn’t damage your car parts immediately. But, if you continue to drive with your engine running lean, it might overheat and even damage internal engine parts.

What causes a lean condition on Bank 1 and Bank 2?

There are several possible causes: There is a leak between the MAF or MAP sensor and the rest of the intake, giving the ECU a false air reading. This is usually caused by a loose clamp or a disconnected hose to the intake. The injectors aren’t spraying enough fuel.

Can a bad O2 sensor cause a P0174 code?

You probably know that the answer the questions is — no! A P0171 or P0174 lean code with an O2 sensor reading lean all the time mean — well, several things. The real problem may not be a bad O2 sensor, but possibly be an engine vacuum leak, low fuel pressure or dirty fuel injectors that are causing the engine run lean.

Where is Bank 1 sensor 2 located?

The first sensor is placed between the engine and the catalytic converter. While the second is located behind it if you know this it’s very easy to locate the faulty O2 sensor.